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WO2006109874A1 - Procede d'optimisation des echanges d'informations sur un accuse de reception dans une communication asynchrone entre un terminal et un reseau - Google Patents

Procede d'optimisation des echanges d'informations sur un accuse de reception dans une communication asynchrone entre un terminal et un reseau Download PDF

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Publication number
WO2006109874A1
WO2006109874A1 PCT/JP2006/307988 JP2006307988W WO2006109874A1 WO 2006109874 A1 WO2006109874 A1 WO 2006109874A1 JP 2006307988 W JP2006307988 W JP 2006307988W WO 2006109874 A1 WO2006109874 A1 WO 2006109874A1
Authority
WO
WIPO (PCT)
Prior art keywords
mobile equipment
base stations
base station
network
data
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2006/307988
Other languages
English (en)
Inventor
Michael Roberts
Frank Savaglio
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Priority to EP06731924A priority Critical patent/EP1867179A1/fr
Priority to JP2007546359A priority patent/JP4771093B2/ja
Priority to US11/887,991 priority patent/US8064429B2/en
Publication of WO2006109874A1 publication Critical patent/WO2006109874A1/fr
Anticipated expiration legal-status Critical
Priority to US13/172,373 priority patent/US8279774B2/en
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1642—Formats specially adapted for sequence numbers
    • H04L1/165—Variable formats
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1657—Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1692—Physical properties of the supervisory signal, e.g. acknowledgement by energy bursts
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1803—Stop-and-wait protocols
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff

Definitions

  • the present invention is located in a field of telecommunications, and more specifically relates to the method for optimizing exchanges of acknowledgement signals between a mobile equipment such as a mobile terminal in asynchronous communication with a plurality of base stations of a cellular telecommunication network during which the mobile equipment sends data to the base stations and each base station is able to return a positive acknowledgement ACK to the mobile equipment if this base station receives correctly the data transmitted by the mobile equipment, or a negative acknowledgement NACK if it does not receive correctly the data transmitted by the mobile equipment.
  • a mobile equipment such as a mobile terminal in asynchronous communication with a plurality of base stations of a cellular telecommunication network during which the mobile equipment sends data to the base stations and each base station is able to return a positive acknowledgement ACK to the mobile equipment if this base station receives correctly the data transmitted by the mobile equipment, or a negative acknowledgement NACK if it does not receive correctly the data transmitted by the mobile equipment.
  • the present invention also relates to mobile equipment capable of transmitting data to a plurality of base stations of a cellular telecommunication network and for receiving a positive acknowledgement ACK from a base station, if the data was all correctly received by the base station, or a negative acknowledgement NACK if the data was incorrectly received by the base station.
  • the specifications of the group 3GPP adopt an architecture similar to that of the service HSDPA (High Speed Downlink Packet Access) to provide throughputs up to 2 Mbps (megabits per second) via an EUDCH (Enhanced Uplink Dedicated Channel) uplink channel or HSUPA (High Speed Uplink Packet Access) for future multimedia applications in UMTS (Universal Mobile Telecommunications System).
  • HSDPA High Speed Downlink Packet Access
  • EUDCH Enhanced Uplink Dedicated Channel
  • HSUPA High Speed Uplink Packet Access
  • UMTS Universal Mobile Telecommunications System
  • the specifications of the group 3GPP provide to add a supplementary protocol layer HARQ (Hybrid Automatic Request), at the level of the MAC (Media Access Control) sub-layer of layer 2 of the radio interface protocols.
  • HARQ Hybrid Automatic Request
  • the new protocol layer HARQ is provided to allow the base stations of the network to transmit positive acknowledgement signals ACK to the terminal if all the packets transmitted by the terminal are correctly received by base stations or a negative acknowledgement sign signal NACK if all the packets transmitted by the terminal are not correctly received by base stations.
  • ACK positive acknowledgement signals
  • NACK negative acknowledgement sign signal
  • these specifications of the group of 3GPP provide that all the cells involved in a communication with the terminal send explicitly a positive acknowledgement ACK if the transmission is correct, which increases interferences at terminal level.
  • the number of NACK is about from 10% to 20% and the number of ACK represents 90%, it would be advantageous to provide a mechanism allowing base stations to get rid of emitting ACKs to the terminal when it is possible to deduce implicitly that the data were received.
  • base stations of a network do not expect to receive data during a predetermined time, and therefore will not be able to transmit to the terminal an acknowledgement indicating that the data was not received in case of a radio linkage problem between the terminal and the network. Then the terminal continues transmitting the data needlessly while they are not correctly received by the network.
  • a first object of the present invention is to allow base stations to detect a transmission error in an asynchronous communication.
  • a second object of the invention is to reduce the number of acknowledgement signals transmitted to mobile equipment such as a mobile terminal by base stations of a network.
  • Another object of the invention is to allow mobile equipment such as a mobile terminal to determine the type of acknowledgement that it needs from the analysis of its proper radio conditions.
  • the method according to the invention comprises the following steps of: synchronizing the mobile equipment with the network; and estimating quality of downlink communication between each base station and the mobile equipment on at least one standardized channel, such that if at least one base station returns an acknowledgement to the mobile equipment, the mobile equipment only requests a negative acknowledgement NACK from the base stations whilst the data is continuously being transmitted, and if all the base stations return a negative acknowledgement NACK to the mobile equipment, the mobile equipment only requests a positive acknowledgement ACK from the base stations during the current communication.
  • the terminal if at least one base station returns a positive acknowledgement ACK to the terminal (i.e., the mobile equipment), the terminal requires only a negative acknowledgement NACK from the base stations during a current communication and, if all base stations return a negative acknowledgement NACK to the terminal, the terminal requires only a positive acknowledgement ACK from the base stations while data is continuously transmitted.
  • the mobile equipment re-transmits the data only if estimated quality of all the channels is less than a predetermined value.
  • the mobile equipment re-transmits the data only if the estimated quality of at least one channel is less than a predetermined value and is all the other base stations send a negative acknowledgement NACK to the mobile equipment.
  • the invention is implemented by a mobile equipment such as for example a GSM (Global System for Mobile Communications) or UMTS telephone, capable of transmitting data to a plurality of base stations of a cellular telecommunication network and of receiving a positive acknowledgement ACK from a base station, if the data was correctly received by the base station, or a negative acknowledgement NACK, if the data was incorrectly received by the base station.
  • a mobile equipment such as for example a GSM (Global System for Mobile Communications) or UMTS telephone, capable of transmitting data to a plurality of base stations of a cellular telecommunication network and of receiving a positive acknowledgement ACK from a base station, if the data was correctly received by the base station, or a negative acknowledgement NACK, if the data was incorrectly received by the base station.
  • GSM Global System for Mobile Communications
  • This mobile equipment includes: means for estimating quality of downlink communication of each base station of the network on at least one standardized channel; and decision making means for either only requesting a negative acknowledgement NACK or only a positive acknowledgement ACK from the base stations depending on the quality of the estimated communication channel.
  • the present invention allows optimizing exchanges of the acknowledgement signals ACK and NACK between the mobile equipment and the base stations, thus reducing the interferences at mobile equipment level.
  • FIG. 1 is a schematic view illustrating a synchronizing phase of a terminal with a network
  • FIG. 2 is a schematic view illustrating a first situation in a network in which the method according to the present invention is implemented
  • FIG. 3 is a schematic view illustrating a second situation in the network in which the method according to the present invention is implemented
  • FIG. 4 is a schematic view illustrating a third situation in the network in which the method according to the present invention is implemented.
  • FIG. 5 is a block diagram illustrating an example of a mobile terminal according to the present invention. Best Mode for Carrying out the Invention:
  • the following description relates to an implementation of the present invention in a network based on the WCDMA (wideband code division multiple access) technology. More precisely, the invention will be described in a UMTS network.
  • WCDMA wideband code division multiple access
  • the radio interface contains three main layers:
  • Layer 2 is composed of four sub-layers:
  • the new protocol layer HARQ intended to control acknowledgement signaling between base stations and terminals is provided at MAC sub-layer level.
  • the network transmits permanently to a terminal in a current cell a primary code and a second code of synchronization respectively via a primary channel PSCH (Primary Synchronization Channel) and a secondary channel SSCH (Secondary Synchronization Channel) for identifying the neighboring UMTS cells, as well as a beacon channel called CPICH (Common Pilot Channel) for estimating pulse response of the propagation channel.
  • PSCH Primary Synchronization Channel
  • SSCH Secondary Synchronization Channel
  • CPICH Common Pilot Channel
  • the CPICH channel is composed of a predefined sequence of bits/symbols (so-called pilot) which are permanently transmitted over the cells. Throughput of these bits/symbols is constant and equal to 30 kbps (kilobits per second), that is 15 ksps (kilo-symbols per second).
  • the CPICH channel is not associated with transportation channel. Contrary to a synchronous communication in which the base stations and the terminal know that during a TTI time (Transmission Time Interval) a transportation block will be exchanged, in an asynchronous communication, the base stations of the network do not know the timing at which the terminal starts transmitting the data. Also, a first phase of the method consists in synchronizing the terminal and the network.
  • FIG. 1 illustrates schematically the synchronizing phase of a mobile terminal MS and a base station BS of the network.
  • the terminal MS sends to the base station BS the data packets accompanied with a request in which the terminal asks to the base stations to return to it a positive acknowledgement ACK at the end of a predetermined time D. If the terminal does not receive the ACK signal from the network (step 12), the terminal returns (step 14) the data and the request and estimates the quality of the link from the pulse response of the propagating channel measured in the CPICH channel. Upon receiving a positive acknowledgement ACK from at least one base station (step 16), the terminal returns (step 18) the data accompanied with a request in which the terminal asks to the base stations to only send negative acknowledgements NACK as far as the estimated quality of the link is higher than a predefined quality.
  • FIG. 2 illustrates schematically mobile terminal 20 in asynchronous communication with three base stations 22, 24 and 26 of the network. In the communication illustrated in FIG. 2, all the base stations received correctly the data transmitted by terminal 20.
  • terminal 20 sends (arrow 30) data packets to base stations 22, 24 and 26 and receives at the same time pilot bits/symbols from each of the base stations (arrow 32) via the CPICH channel.
  • terminal 20 determines power of the signals received from each base station 22, 24, 26 from the analysis of the bits/symbols transmitted via the CPICH channel, and compares the measured powers with a predetermined threshold power. If the power measured for each base station is higher than the threshold value, the terminal deduces that the transmitted packets were correctly received by base stations 22, 24 and 26 and sends (arrow 34, FIG. 2C) next packets without waiting for an ACK signal. Thanks to this mechanism, terminal 20 deduces an implicit ACK signal from the measurements made on the CPICH channel. Therefore, base stations 22, 24 and 26 are exempt from transmitting explicitly an ACK signal to the terminal. This allows power saving on a downlink, which can be allocated to another function.
  • FIG. 3 illustrates schematically a second situation in which some base stations did not correctly receive the data transmitted by the terminal.
  • terminal 20 sends (arrow 30) data packets to base stations 22, 24 and 26 and receives at the same time pilot bits/symbols from each station (arrow 32) via the CPICH channel.
  • base station 22 sends a NACK signal (arrow 40, FIG. 3B) to terminal 20.
  • terminal 20 determines power of the signals received from each base station 22, 24, 26 from the analysis of the bits/symbols transmitted via the CPICH channel and compares the measured powers with the predetermined threshold power.
  • the decision module contained in terminal 20 deduces that the packets sent by terminal 20 were correctly received at least by base stations 24 and 26 and sends (arrow 42, FIG. 3C) next packets without waiting for an ACK signal and without taking into account the NACK signal (arrow 40) emitted by base station 22.
  • Base stations 22, 24 and 26 continue sending (arrow 32) bits/symbols to the terminal via the CPICH channel.
  • the method according to the invention allows us to take into consideration in this case an attenuation of the signal emitted by base station 22 due physical conditions of transmission and to avoid retransmission of packets insofar as other base stations received correctly the packets emitted by the terminal.
  • FIG. 4 illustrates schematically a third situation in which no base station received correctly the data transmitted by the terminal.
  • terminal 20 sends (arrow 30) data packets to base stations 22, 24 and 26 and receives at the same time pilot bits/symbols from each base station (arrow 32) via the CPICH channel.
  • two base stations 22 and 24 send a NACK signal to terminal 20 (arrows 50 and 52, FIG. 4B).
  • terminal 20 determines power of the signals received from each base station 22, 24, and 26 from the analysis of the bits/symbols transmitted via the CPICH channel and compares the measured powers with a predetermined threshold power.
  • the terminal deduces that none of base stations 22, 24 or 26 correctly received the packets sent by terminal 20.
  • Terminal 20 returns (FIG. 4C) the same packets to the base stations (arrow 60) and carries out again measures on the signals transmitted by the base stations (arrow 32) via the CPICH channel. This operation will be repeated until at least one of base stations 22, 24 or 26 receives correctly the packets emitted by terminal 20.
  • Terminal 20 has antenna 70 for communicating with the base stations over the air, transmitter circuit 72 connected to antenna 70, receiver circuit 74 connected to antenna 70, estimation module 76, decision module 78, and control module 80.
  • Estimation module 76 is connected to receiver circuit 74, and arranged for estimating quality of downlink communication from each base station on the CPICH channel. Specifically, estimation module 76 receives the pilot bits/symbols transmitted via the CPICH channel from receiver circuit 74, analyzes the pilot bits/symbols, and measures the power of reception signals from the result of the analysis.
  • Decision module 78 receives the measured power from estimation module 76, and makes the decision whether terminal 20 requests only a negative acknowledgement NACK or requests only a positive acknowledgement ACK from the base stations depending on the measured power.
  • Control module 80 is provided for managing the synchronization process of terminal 20 with the network, and for controlling the exchanges of data packets and acknowledgement signals between terminal 20 and the base stations as described above in accordance with the result of decision in decision module 78.
  • the invention allows optimizing exchanges of the signals ACK and NACK between the terminal and the network, thus reducing the interferences at terminal level.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Communication Control (AREA)

Abstract

Dans un procédé d'optimisation des échanges de signaux d'accusés de réception entre un équipement mobile se trouvant en communication asynchrone avec une pluralité de stations de base appartenant à un réseau de télécommunications cellulaire, le terminal envoie des données vers les stations de base et chaque station de base peut renvoyer au terminal un accusé de réception positif ACK ou un accusé de réception négatif NACK. Le procédé inclut les étapes consistant : à synchroniser l'équipement mobile avec le réseau et à estimer la qualité de la communication de liaison descendante entre chaque station de base et l'équipement mobile sur au moins un canal normalisé, de telle sorte que, si au moins une station de base renvoie un accusé de réception à l'équipement mobile, l'équipement mobile ne requiert qu'un accusé NACK en provenance des stations de base pendant que les données sont transmises de manière continue, et si la totalité des stations de base renvoie un accusé NACK à l'équipement mobile, l'équipement mobile ne requiert qu'un accusé ACK en provenance des stations de base pendant la communication en cours.
PCT/JP2006/307988 2005-04-08 2006-04-10 Procede d'optimisation des echanges d'informations sur un accuse de reception dans une communication asynchrone entre un terminal et un reseau Ceased WO2006109874A1 (fr)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP06731924A EP1867179A1 (fr) 2005-04-08 2006-04-10 Procede d'optimisation des echanges d'informations sur un accuse de reception dans une communication asynchrone entre un terminal et un reseau
JP2007546359A JP4771093B2 (ja) 2005-04-08 2006-04-10 端末とネットワークとの間での非同期通信における確認応答についての情報の交換を最適化する方法
US11/887,991 US8064429B2 (en) 2005-04-08 2006-04-10 Method for optimizing exchanges of information on acknowledgement in asynchronous communication between terminal and network
US13/172,373 US8279774B2 (en) 2005-04-08 2011-06-29 Description method for optimizing exchanges of information on acknowledgement in asynchronous communication between terminal and network

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0550911 2005-04-08
FR0550911A FR2884375B1 (fr) 2005-04-08 2005-04-08 Procede d'optimisation des echanges d'information d'accuse de reception dans une communication asynchrone entre un terminal et un reseau

Related Child Applications (2)

Application Number Title Priority Date Filing Date
US11/887,991 A-371-Of-International US8064429B2 (en) 2005-04-08 2006-04-10 Method for optimizing exchanges of information on acknowledgement in asynchronous communication between terminal and network
US13/172,373 Continuation US8279774B2 (en) 2005-04-08 2011-06-29 Description method for optimizing exchanges of information on acknowledgement in asynchronous communication between terminal and network

Publications (1)

Publication Number Publication Date
WO2006109874A1 true WO2006109874A1 (fr) 2006-10-19

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PCT/JP2006/307988 Ceased WO2006109874A1 (fr) 2005-04-08 2006-04-10 Procede d'optimisation des echanges d'informations sur un accuse de reception dans une communication asynchrone entre un terminal et un reseau

Country Status (6)

Country Link
US (2) US8064429B2 (fr)
EP (1) EP1867179A1 (fr)
JP (1) JP4771093B2 (fr)
CN (1) CN101156467A (fr)
FR (1) FR2884375B1 (fr)
WO (1) WO2006109874A1 (fr)

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Publication number Priority date Publication date Assignee Title
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Also Published As

Publication number Publication date
US20110256862A1 (en) 2011-10-20
JP2008535288A (ja) 2008-08-28
CN101156467A (zh) 2008-04-02
JP4771093B2 (ja) 2011-09-14
US8279774B2 (en) 2012-10-02
US8064429B2 (en) 2011-11-22
EP1867179A1 (fr) 2007-12-19
FR2884375A1 (fr) 2006-10-13
US20090061880A1 (en) 2009-03-05
FR2884375B1 (fr) 2007-11-23

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